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It probably just means prostate cancer represents a tiny portion of mortality, so even a significant difference appears tiny and within the bounds of error. Remember, the finding is not "no difference" but "failed to find a difference". Statistics does not ever prove "no difference".

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Actually not even that. The study found a difference but the effect was not large enough or the study was too small to prove that the effect could not possibly have been due to chance.

Time and time again we get people who should know better equating "no significant difference found" with "found that there was no difference".

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